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Model S PTC heater control?

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Hello TMC,

I've gotten some good information lurking over the past year or two, thanks all! Wondering if anyone has successfully figured out how to control the PTC air heater in the HVAC unit yet? I just received a used one from eBay for a non-tesla related project I'm working on. It's 4 pin, so I'm assuming either PWM or CANbus control. It's dual zone, so I imagine it's either +12V, GND, PWM1, PWM2, or in the CANbus case, +12V, GND, CAN HI, CAN LO. Any insight?